Question

Ritesh cover 51 km in 3 hours calculate it's speed​

Answer 1

17 km/hr

Explanation:

Speed is measured as the ratio of distance to the time in which the distance was covered

`S=(51)/(3)\text{km/hr}\\=17\text{km/hr}`

Answer 2

speed = 153 km/h

Explanation:

speed = dist x time

so speed would be 51*3

speed = 153 km/h